Plausibly yes, but I’d be worried enough about residual exposure (reflections off walls, improper installation) to other UV wavelengths that installation is likely to require some care and expense too. The second link has several accounts of acute health effects from people doing upper room UV wrong. Probably still great to have in train stations, airports etc though given the enormous benefit/cost ratio.
how much more effective is far UVC (shone directly on people) vs upper room UV?
I’m not really sure, there would be a component from surfaces and a component from extra ACH due to not relying on vertical air mixing. There are probably studies.
Plausibly yes, but I’d be worried enough about residual exposure (reflections off walls, improper installation) to other UV wavelengths that installation is likely to require some care and expense too. The second link has several accounts of acute health effects from people doing upper room UV wrong. Probably still great to have in train stations, airports etc though given the enormous benefit/cost ratio.
I’m not really sure, there would be a component from surfaces and a component from extra ACH due to not relying on vertical air mixing. There are probably studies.
What about negative effects on the symbiotic microbiome?